256450478 has 16 divisors (see below), whose sum is σ = 396530304. Its totient is φ = 124299360.

The previous prime is 256450477. The next prime is 256450489. The reversal of 256450478 is 874054652.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256450477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14243 + ... + 26753.

It is an arithmetic number, because the mean of its divisors is an integer number (24783144).

Almost surely, 2^256450478 is an apocalyptic number.

256450478 is a deficient number, since it is larger than the sum of its proper divisors (140079826).

256450478 is a wasteful number, since it uses less digits than its factorization.

256450478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12827.

The product of its (nonzero) digits is 268800, while the sum is 41.

The square root of 256450478 is about 16014.0712499976. The cubic root of 256450478 is about 635.3326448591.

The spelling of 256450478 in words is "two hundred fifty-six million, four hundred fifty thousand, four hundred seventy-eight".